Belt guards for sewing machines



Sept. 29, 1959 H. J. GOOSMAN 2,906,223

BELT GUARDS FOR SEWING MACHINES Filed Dec. 17, 1956 J IN V EN TOR.

Herbert J. Goosman WITNESS W w Gav ATTORNEY i [a J i,

BELT GUARDS FOR SEWING MACHINES vHerbert J; Goosman, Watchung, NJ., assignor to The Singer Manufacturing Company, Elizabeth, N.J., a corporation of New Jersey Application December 17, 1956, Serial No. 628,705

" 3 Claims. (Cl. 112-261) 'Ihere is still, however, a considerable market in those places where electrical power is not economically available for treadle-driven sewing machines of modern design.

In accordance with the present invention, there has been provided means for converting to a treadle drive a sewing machine that is designed to be motor driven, which conversion requires a minimum of modification of the machine and which employs a belt guard that will not detract from the appearance of the machine, is inexpensive, can be readily attached to and removed from the machine, and is durable and efiicient.

Having in mind the above and other objects that will be evident from an understanding of this disclosure, the invention comprises the devices, combinations and arrangements of parts as illustrated in the presently preferred embodiment of the invention which is hereinafter set forth in such detail as to enable those skilled in the art readily to understand the function, operation, construction and advantages of it when read in conjunction with the accompanying drawings in which:

Fig. 1 is a fragmentary front elevational view of a sewing machine embodying the present invention.

Fig. 2 is an end elevational view of the sewing ma chine of Fig. 1, with portions broken away and in section.

Fig. 3 is a perspective view of the belt guard per se.

The present invention is illustrated in a sewing machine such as disclosed in the Peets Patent No. 2,617,375, to which reference may be had for a more complete description of the construction of the machine. This disclosure is limited to what is believed to be adequate for an understanding of the present invention.

With reference to the drawings, there is disclosed a sewing machine having a frame comprising a bed 1, a standard 2 rising from one end of the bed, and a bracket arm 3 carried by the standard. The bed 1 includes a bed plate 4, the upper surface of which comprises the work supporting surface 5 of the machine, and walls including a front wall 6, end wall 7 and rear wall 8 depending from the bed plate 5 and enclosing the bed mechanism of the machine. The open top of the bracket arm 3 is normally closed by a cover plate 9.

A main shaft 14) is journaled longitudinally of the bracket arm 3 and upon the standard end thereof has mounted a combined hand wheel and belt pulley 11 including a hand 'wheel12 and a belt pulley 13 having a belt groove 14 and a hub 15. The combined hand wheel and belt pulley 11 is releasably secured to the shaft in the usual manner by a clamp nut 16. With reference to the above noted Peets Patent, No. 2,617,375, it will be Unitfid ates Patent t Patented Sept. 29, 1959 ice . 2 understood that the frame of the machine is provided with a recess 17 for accommodating the motor driven gear on the hub of the hand wheel and in which the hub 15 of the present construction is fitted. At the same time, this recess has an enlarged diameter outer portion 18 to accommodate an offset portion of the hand wheel and which in the present construction accommodates the belt pulley 13. The recess 17 is partiallysurrounded by a Wall 19 integral with the frame and the enlarged portion 18 is partially surrounded by a wall 20 integral with the machine frame. A belt 21 is entrained about the belt pulley 13, the belt 21 having a rear leg 22 and a front leg 23. To accommodate the rear leg 22 of the belt there is provided a run internally of the standard 2, which run extends through an aperture 24 provided in the wall 20 and through the space internally of the standard 2 that normally accommodates the driving motor as illustrated in the Peets Patent No. 2,617,375. To obtain the proper lead for this belt run, having in mind the size of the belt pulley of the treadle mechanism and the relative spacing between it and the belt pulley 13, there is provided an extension 25 on the rear wall 8 of the bed 1.

Also to obtain the proper lead for the belt 21 the front leg 23 extendsthrough an aperture 26 provided in the front wall of the bracket arm 3, downwardly along the front of the standard 2 in the plane defined by the belt pulley 13, and through an aperture 27 in the bed plate 4. At the same time, the front face of the wall 6 of the bed is provided with a clearance slot 28.

The exposed portion of the front leg 23 of the belt 21 in the run extending between the apertures 26 and 27 is covered by a belt guard, designated generally as 29. The belt guard 29 is U-shaped in cross section and includes a bottom wall 30 that is arranged parallel to the belt run when the guard is in operative position and opposed sides or legs 31 that are disposed upon opposite sides of the belt run. The free edges 31a of the legs 31 coincide substantially with the adjacent outer surface of the standard 2 and against which they abut when the guard is in operative position. To secure the guard 29 in position, there is provided a finger 32 integral with the lower portion of the bottom wall 30 that extends through the aperture 27 in the bed plate 4 and engages 29 and resiliently cooperating with a rise 34 on the upper edge of the bracket arm 3. The cover plate 9 also cooperates with the spring clip finger 33 to prevent accidental displacement of the guard.

Numerous alterations of the structure herein disclosed will suggest themselves to those skilled in the art. However, it is to be understood that the present disclosure relates to a preferred embodiment of my invention which is for purposes of illustration only and not to be construed as a limitation of the invention. All such modifications which do not depart from the spirit of the invention are intended to be included Within the scope of the appended claims.

Having thus set forth the nature of the invention, what I claim herein is:

1. In a sewing machine, a frame comprising a bed having a bed plate, a standard rising from one end of said bed and a bracket arm carried by said standard and overhanging said bed, a main shaft journaled longitudinally of said bracket arm, a belt pulley mounted upon said shaft in said bracket arm and above said standard, said bracket arm having an aperture in register with said belt pulley and adjacent to the periphery of said belt pulley and said bed plate having an aperture also in register with said belt pulley, said apertures defining a portion of one run for a belt entrained about said b'elt pulley with the portion of the run between the apertures extending externally of said standard, and a belt guard for shielding the exposed portion of the run.

2. In a sewing machine, a frame comprising a bed having a bed plate, a standard rising from one end' of said bed and a bracket arm carried by said standard and overhanging said bed, a main shaft journaled longitudinally of said bracket arm, a belt pulley mounted upon said shaft in said bracket arm and above said standard, said bracket arm having an aperture in register with said belt pulley and adjacent to the periphery of said belt pulley and said bed plate having an aperture also in register with said belt pulley, said apertures defining a portion of one run for a belt entrainedabout said belt pulley with the portion of the run between the apertures ex tending externally of said standard, a U-shaped belt guard for shielding the exposed portion of the run, said belt guard comprising a bottom wall disposed substantially parallel to the run and opposed legs disposed upon each side of the run, said legs having the free edges thereof formed substantially to abut against the outer surface of the standard, and means for securing said belt guard in operative position.

3. In a sewing machine, a frame comprising a bed having a bed plate, a standard rising from one end to said bed and a bracket arm carried by said standard and overhanging said bed, a main shaft journaled longitudinally of said bracket arm, a belt pulley mounted upon said shaft in said bracket arm and above said standard,

said bracket arm having an aperture in register with said belt pulley and adjacent to the periphery of said belt pulley and said bed plate having an aperture also in register with said belt pulley, said apertures defining a portion of one run for a belt entrained about said belt pulley with the portion of the run between the apertures extending externally of said standard, a U-shaped belt guard for shielding the exposed portion of the run, said belt guard comprising a bottom wall disposed substantially parallel to the run and opposed legs disposed upon each side of the run, said legs having the free edges thereof formed substantially to abut against the outer surface of the standard, and means for securing said belt guard in operative position'comprising a finger at the lower end of said belt guard extending through the aperture in said bed plate and underlying said bed plate to secure the lower end of said belt guard to said bed plate, and a spring clip finger at the upper end of said belt guard and resiliently cooperating with said bracket arm to secure the upper end of said belt guard to said bracketarm.

References Cited in the file of this patent UNITED STATES PATENTS 862,240 Diehl Aug. 6, 1907 884,647 Edens Apr. 14, 1908 947,651 Schreiber Jan. 25, 1910 1,251,251 Lindeburg Dec. 25, 1917 1,311,114 Dosch et al July 22, 1919 

